# 50+ Reversal Array Operation MCQs with FREE PDF

We have the best collection of the Reversal Array Operation MCQs and answer with FREE PDF. These Reversal Array Operation MCQs will help you to prepare for any competitive exams like: BCA, MCA, GATE, GRE, IES, PSC, UGC NET, DOEACC Exams at all levels – you just have to practice regularly.

## Reversal Array Operation MCQs

a) true

b) false

#### 2. Which of the following is the predefined function for array reversal in C++?

a) reverse()

b) arr_reverse()

c) array_reverse()

d) rev()

#### 3. Which of the following is the predefined function for array reversal in javascript?

a) reverse()

b) arr_reverse()

c) array_reverse()

d) rev()

a) math

b) stdio

c) stdlib

d) algorithm

a) 2,3,5,4

b) 4,2,3,5

c) 5,4,2,3

d) 2,4,5,3

#### 6. How many swaps are required for reversing an array having n elements where n is an odd number?

a) (n-1) / 2

b) n/2

c) (n/2) – 1

d) (n+1)/2

Answer: (n-1) / 2

a) (n-1) / 2

b) n/2

c) (n/2) – 1

d) (n+1)/2

#### 8. What will be the output of the following code?

``````#include <bits/stdc++.h>
using namespace std;

void func(int arr[], int left, int right)
{
while (left < right)
{
int temp = arr[left];
arr[left] = arr[right];
arr[right] = temp;
left++;
right--;
}

}

void printArray(int arr[], int size)
{
for (int i = 0; i < size; i++)
cout << arr[i] << " ";
}

int main()
{
int arr[] = {1,4,3,5};
int n = sizeof(arr) / sizeof(arr);
func(arr, 0, n-1);
printArray(arr, n);
return 0;
}
``````

a) 5 1 4 3

b) 3 5 1 4

c) 5 3 4 1

d) error

Answer: 5 3 4 1

#### 9. What will be the time complexity of the following code?

``````#include <bits/stdc++.h>
using namespace std;
void func(int arr[], int left, int right)
{
while (left < right)
{
int temp = arr[left];
arr[left] = arr[right];
arr[right] = temp;
left++;
right--;
}

}

void printArray(int arr[], int size)
{
for (int i = 0; i < size; i++)
cout << arr[i] << " ";
}

int main()
{
int arr[] = {1,4,3,5};
int n = sizeof(arr) / sizeof(arr);
func(arr, 0, n-1);
printArray(arr, n);
return 0;
}
``````

a) O(n)

b) O(log n)

c) O(1)

d) O(n log n)

#### 10. What will be the output of the following code?

``````#include <bits/stdc++.h>
using namespace std;
void func(int a[], int n, int k)
{
if (k <= n)
{
for (int i = 0; i < k/2; i++)
swap(a[i], a[k-i-1]);
}

}
int main()
{
int a[] = {1, 2, 3, 4, 5};
int n = sizeof(a) / sizeof(int), k = 3;
func(a, n, k);
for (int i = 0; i < n; ++i)
cout << a[i]<<" ";
return 0;
}
``````

a) 3 2 1 4 5

b) 5 4 3 2 1

c) 1 2 5 4 3

d) error

Answer: 3 2 1 4 5